* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

a {
    text-decoration: none;
    color: #fff;
}

li {
    list-style: none;
}

i,
em {
    font-style: normal;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 400;
}

body {
    height: 3000px;
}

// 头部区域开始
nav {
    display: flex;
    width: 100%;
    height: 80px;
    background-color: rgba(0, 0, 0, .2);
    position: absolute;
    top: 0;
    left: 0;
    justify-content: center;

    .top-nav {
        width: 1000px;
        height: 80px;
        display: flex;
        justify-content: space-between;
        align-items: center;

        .download-more {
            font-size: 20px;
            color: #fff;
            color: rgba(255, 255, 255, .9);
        }
    }

}

header {
    background: url(../../images/client/bg_video.png) no-repeat 50%;
    background-size: cover;
    height: 600px;
    max-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

    h1 {
        width: 478px;
        height: 67px;
        font-size: 0;
        margin-top: 90px;
        background: url(../../images/client/video.png) 0 -176px no-repeat;
        animation: h1 .8s .4s linear forwards;

    }

    h2 {
        margin-top: 50px;
        color: rgba(86, 86, 86, 1);
        font-size: 32px;
        animation: h2 .8s .4s linear forwards;
        transform: translateY(10px);
    }

    a {
        width: 300px;
        height: 60px;
        margin-top: 150px;
        font-size: 0;
        background: url(../../images/client/video.png) -152px -74px no-repeat;
        animation: a .8s .4s linear forwards;
    }
}

main {
    margin-top: 100px;
    border-bottom: 1px solid #f0f0f0;
}

.main-content {
    height: 670px;
    text-align: center;
    background: url(../../images/client/bg_new.png) 50% no-repeat;
    overflow: hidden;
    margin-bottom: 30px;

    h2 {
        font-size: 32px;
        font-weight: 700;
        animation: h2 .8s .4s linear forwards;
    }

    h3 {
        color: #696969;
        font-size: 26px;
        margin: 20px 0;
        animation: h2 .8s .4s linear forwards;
    }

    img {
        margin-top: 20px;
        animation: h2 .8s .4s linear forwards;
    }

    &:hover h2 {
        animation: h2 .8s .4s linear forwards;
    }

    &:hover h3 {
        animation: h2 .8s .4s linear forwards;
    }

    &:hover img {
        animation: h2 .8s .4s linear forwards;
    }
}

.mc2 {
    background: url(../../images/client/bg_skin.png) 50% no-repeat;
}

.mc3 {
    background: url(../../images/client/bg_hq.png) 50% no-repeat;
    overflow: hidden;
}

.bottom_btn {
    text-align: center;
    margin-top: 100px;
    animation: h2 .8s .4s linear forwards;
}

footer {
    width: 100%;
    height: 104px;
    font-size: 12px;
    color: #777777;
    text-align: center;
    margin-top: 80px;
    padding-top: 30px;

    a {
        color: #777777;
    }
}

.mac .top-nav .logo {
    img {
        width: 247px;
        height: 44px;
    }
}

.mac nav {
    background: rgba(255, 255, 255, .2);
}

.mac .top-nav .download-more {
    color: #000;
    font-size: 17px;
}



.mac header h1 {
    width: 1200px;
    font-size: 63px;
    font-weight: 700;
    color: #363231;
    text-align: center;
    background-image: none;
    letter-spacing: 74px;
    margin-left: 50px;
}

.mac header h2 {
    font-size: 28px;
    font-weight: 700;
    color: #565656;
    text-align: center;
    margin-top: 20px;
}

.mac header a {
    display: block;
    width: 300px;
    height: 50px;
    line-height: 50px;
    text-align: center;
    font-size: 24px;
    color: #fff;
    border-radius: 999px;
    background: #363231;
    margin: 93px auto 50px;
    background-image: none;
}

.mac header p {
    font-size: 12px;
    color: #646464;
    animation: p .8s .4s linear forwards;
}

.mac .bottom_btn a {
    display: inline-block;
    width: 500px;
    height: 210px;
    background: url(../../images/client/sprite@2x.png) no-repeat 0 -420px;
    background-size: 100%;
}